Journal article
Non-Gaussian properties of second-order wave orbital velocity
A Alberello, A Chabchoub, O Gramstad, AV Babanin, A Toffoli
Coastal Engineering | Elsevier | Published : 2016
Abstract
A stochastic second-order wave model is applied to assess the statistical properties of wave orbital velocity in random sea states below the water surface. Directional spreading effects as well as the dependency of the water depth are investigated by means of a Monte-Carlo approach. Unlike for the surface elevation, sub-harmonics dominate the second-order contribution to orbital velocity. We show that a notable set-down occurs for the most energetic and steepest groups. This engenders a negative skewness in the temporal evolution of the orbital velocity. A substantial deviation of the upper and lower tails of the probability density function from the Gaussian distribution is noticed; velocit..
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Funding Acknowledgements
This work was supported by the Swinburne University of Technology Postgraduate Research Award (SUPRA). Experiments were funded by the E.U. 7th Framework Programme through the Integrated Infrastructure Initiative HYDRALAB IV (Contract No. 022441). A.A. and A.T. thank Miguel Onorato for valuable discussions on wave orbital motions. A.C. acknowledges support from the Burgundy Region and The Association of German Engineers (VDI). A.C. is an International Research Fellow of the Japan Society for the Promotion of Science (JSPS).